Malicious PDF — malware analysis report

Static analysis result for SHA-256 0007856236ebf116…

MALICIOUS

PDF

50.4 KB Created: 2020-04-02 21:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 7bce590753df30ed5d0e1dc600b89dba SHA-1: 52596c79874576fcd6312a979ddc7bc3457af885 SHA-256: 0007856236ebf1160e0d93337c343e9f4220f3ad26d12babcdf4cc3125c07ad7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious due to its structure, which includes a large number of external links pointing to other PDF files, indicative of a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains URLs that are likely used to redirect users to malicious content or phishing sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://impact-active.com/uploads/1/3/0/6/130639131/130639131.html#ewha+korean+textbook+pdf PDF link annotation
    • http://floriowoodworking.com/uploads/1/3/0/7/130738784/bakobujokipub.pdfIn PDF document text
    • http://farishtrust.org/uploads/1/3/0/9/130969061/a65b4b59.pdfIn PDF document text
    • http://adrasteiablaise.com/uploads/1/3/0/5/130590325/berinuzetululezajida.pdfIn PDF document text
    • http://canteenshop.com/uploads/1/3/0/7/130739483/5474758.pdfIn PDF document text
    • http://nobuhotelmarbella.devsite-1.com/uploads/1/3/0/5/130551823/6d04433204fe4fe.pdfIn PDF document text
    • http://mcypaa41.com/uploads/1/3/0/2/130289749/ditupidesexane-refulare.pdfIn PDF document text
    • http://rivervalleymetal.com/uploads/1/3/0/7/130738622/nuluwof.pdfIn PDF document text
    • http://sayn-wittgenstein-piraccini.com/uploads/1/3/0/2/130272557/vabitomu_sazakademelen_wevenejukav_fekozezeviv.pdfIn PDF document text
    • http://wombleinc.com/uploads/1/3/0/6/130620173/bavibelarojipopize.pdfIn PDF document text
    • http://tadpoledryerase.com/uploads/1/3/0/5/130551427/c4859c69d3ad8b0.pdfIn PDF document text
    • http://thecherryontopbakery.com/uploads/1/3/0/8/130874031/1288167.pdfIn PDF document text
    • http://wodenoutdoors.com/uploads/1/3/0/7/130776340/5802617.pdfIn PDF document text
    • http://lead180consulting.com/uploads/1/3/0/5/130539084/d266dc.pdfIn PDF document text
    • http://landandsearepair.com/uploads/1/3/0/5/130539311/wepimisigubipidanimo.pdfIn PDF document text
    • http://swimfunandfitness.com/uploads/1/3/0/5/130539584/ruxaxarira.pdfIn PDF document text
    • http://losangeleshollywoodtours.com/uploads/1/3/0/6/130639533/6054180.pdfIn PDF document text
    • http://coutureeatz.com/uploads/1/3/0/4/130488196/dugatusavavumekam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.adobe.com/).NotoIn extracted file (font_01_sfnt_off0000827c.bin)
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn extracted file (font_01_sfnt_off0000827c.bin)
    • http://scripts.sil.org/OFLNotoIn extracted file (font_01_sfnt_off0000827c.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off0000a638.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off0000a638.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 7708 bytes
SHA-256: 9255cb7fc16a338a813641e06486b560e42e956b5ca81937796be423984f4790
font_01_sfnt_off0000827c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827C 11388 bytes
SHA-256: cf97e0de6512647675ab3185d92c46d807823f861158c2849640fc9cd2c3f4c5
font_02_sfnt_off0000a638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA638 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d